You did mention humping, so weight becomes a very important factor.
Keep in mind. You have too have other survival gear too, well survive.
Food, water, knife, proper clothing etc..
All the weapons in the world are not going to do you any good, if you die of thirst.
Some good posts on weapons choices..
I think your A.O. would be a very important factor also in choosing weapons and ammo.
Out west, I would want a small caliber pistol for small game and food.
Plus a long range nice rifle with sufficent ammo.
Down here in the swamps.
You could probably get by with a .22 mag pistol.
Plus a shotgun, or whatever for bigger critters. Buck shot, slugs.
1000 rounds. My God.
When the UPS driver shows up.
It takes me, the driver and the kid next door too carry it in the house.
If I ever had too hump that much now.
I would probably drop dead, by the time I got too my mailbox.